{
  "manageEntity": {
    "action": "Save",
    "entityId": "999113",
    "entityType": "Track",
    "nonce": "0x2edc46ac3fd3e9e6ae83d57100f3e8f860bf85db4f33efc0cc7a48c97e7b5a8b",
    "signature": "0x72e3820c748b8fdbe89afede27dcf8dd6594693e555f6fc76a3cb3a5c8743e7240709e4ef4ed613fc9db3e5867b93d01be3e6b7ab003bf4317b179a7a0e913b71c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}